So far, the beta seems to be coming along rather nicely. However, it's still got some problems and some that are not affecting the stable Windows release (that I am aware of). Some of the following issues may be posted elsewhere, but since we have no official bug tracker, I'll just list everything I've noticed, as I notice it.

The game is very playable on Linux on my low-end PC (even though there is never anyone online in the beta servers) and very enjoyable so far, outside of the above mentioned bugs and annoyances. I look forward to when it is stable enough for a proper release.

I will post my system specs and L4D2 config tonight, for more information.